As is often the case, I'm getting myself a bit confused with a few details of Colin's model of time.
The specific hypothetical situation is as follows:
Ramla is investigating a possible Darwinist. She's broken into his home and is about to open a storage locker when she receives a chronotech message from herself: “Stop! It blew off my arm!”
Being a smart prophet, she carefully verifies that the locker is trapped before sending anything back and freeing her bandwidth.1
Now, Ramla knows that she doesn't lie when sending messages, so she sends back a new message: “Stop! It's explosive!”
What happens?
I can see a few possible answers:
- She sends back the new message and… nothing changes? This implies branching timelines in the classic sense, not a single timeline.
- She sends back the new message and we retcon the last few minutes such that that was what she sent originally.
- She's forced to send back the original message, despite not wanting to lie.
- The original message was inconsistent with her personality: the GM should have worded it as “Stop! It might blow off your arm!” or better: “Stop! It's a trap!”. This was a GMing mistake, mea culpa.